Did you buy it or got it with War spoils?
If you bought it you can contact Relic or SEGA or Steam. You have the receipt, right?
If it was from War spoils, i guess its bye bye!
You don't get a receipt if you buy it through the ingame store, do you? I don't think there is a difference between items you buy there and warspoil drops. Both can be deleted manually. On the other hand, items you bought through steam can't be deleted. That's why I always preferred the steam store (and there you get a receipt, too).